Performances of the play that explores gender identity were suddenly called off by six elementary schools – five of them with Catholic affiliations – over the last week or so, according to the theater company behind the show.

“Boys, Girls, And Other Mythological Creatures” tells the story of 8-year-old Simon, who dreams of becoming a princess and feels boxed in gender stereotypes.

In emailed comments, the Catholic school board overseeing five of the schools that decided not to put on the play said it was “fully inclusive” but that it was concerned the play sent a message that went beyond the targeted students’ comprehension.

“Following the first performance of the play, it was brought to (our) attention … that the play was not age-appropriate,” said a Niagara Catholic District School Board spokeswoman.

A bill that would amend the country’s Human Rights Act to include explicit protection for transgender people against discrimination is being debated in Canada‘s parliament, said Noa Mendelsohn Aviv, a spokeswoman of the Toronto-based Canadian Civil Liberties Association.